Chain grate stoker



Dec. 25, 1934. I A E- pARKE-R 1,985,297

- CHAIN GRATE STOKER BY l MTTORNEYJ Dec. 25', 1934. A, E. PARKER 1,985,297

CHAIN GRATE sToxER Filed Oct. l2, 1929 2 Sheets-Sheet 2 ATTOR N EY` Patented Dec. 25, 1934 vUmrso sTLATEs PATENTS *OFFICE- y l n vl11,985,297v o y y f o oHaIN GRATE s'roKEa Alfred Edward Parkenllondon, England, assignor to The Babcock 8ak Wilcox Company, Bayonne, N.J.a corporation of NewI Jersey .Applicatibn octber 12; 1929,.siia1No. 399,143 In Great Britain December .6, 1928 Thisl invention relates to a chain grate- Stoker in which grate bars that may be broken or burned away do not interfere with the operation; Cross bars are provided to support the ends Aof the gratev These cross bars are firmlyv connected to other cross members and provide a box-likev girder bars.

construction forv the supportfof the Agrate bars.

l stationary side walls. f

. The invention will be understood'from the description in connection with the accompanying drawings in which Fig. 1 isa perspective View of part of the upper runof the stoker partlybroken away and with some of the grate '.barsomitted;

Fig. 2 isa vertical 4cross section partly broken away through a side portion ofthe stoker; Fig.

3 isa side view of one of: the special grate bars; Fig. e is alsectional viewpartly broken away taken `longitudinally of therstoker, showing some of the details; and Fig. 5` is a similar'viewon an enlarged scale. J

In the drawings, reference character 1 `indion .shaftsZ that are journaled in inner and outer link members 3, so that the wheels travel along the guide rails 4.

Plates 6 extending transversely of the Stoker are provided, upon which the grate bars for supporting the fuel are pivotally mounted, said plates having bulbous heads 5 formed on their upper edges. Each grate bar 7 has as bottom recess 8 near one end shaped to fit the bulb portion of one of the plates 6 and the lower edges of the recess 8 of alternate grate bars in each transverse row are cut away, asindicated at 9, to permit a greater amount of pivoting or turning of these grate bars 7 on the plates 6 than of the intermediate grate bars, thus providing a scissors-like action between adjacent grate bars-to clear the accumulation of ash therebetween. Referrring to Figs. 4 and 5 of the drawings it will be understood that this scissors-like action takes place when the grate bar behind (and aligned with, transversely of the' grate) the right hand bar 7 is not cut away as shown at 9, this relationship of adjacent bars being continued all the way along the corresponding plate 6. The grate bars 7 may be provided with sloping end portions in the usual way.

Transverse bar supports 10 have their ends connected by bolts l1 to flanges of channel irons 12 which are riveted or otherwise connected, as

indicated at 13, to the inner links 3. Bolts 14 cates a series of grooved wheels that are mountedr nel irons 12. Channel irons 15 are connected to the 'outer sides of -thev outer links 3 and the plates 6` are-fsecured by means oil the bolts 16 to 'the p channel irons .15.

Grate bars 17 of special design, which differ from the grate bars 7,'are' connected to the ends ofthe plates 6. The grate bars 17 are provided with recesses 18 in their outer surfaces to receive Cotter pins 19 which passthroughthe plates`6 and lie in the recesses 18 to keep the grate bars 17 on theplates 6.

A stationary side wall 20 is provided along-each side of the chain gratestoker and an angle iron 21. is connected to the inside of each wall 20 near the lower ends of the grate bars 17. f

#By thefgrate bar rests r10, provision is made for supporting gratebarswhichmay have had the v sloping endstthereof broken off or 'burned away too much to rest up'on'the succeedinggrate bars, andthe grate bar rests l0v being connected to the framework form girders for supporting the grate bars `and strengthening the Stoker. The provision lof the special grate 17at theedges of the Stoker makes it possible for the ashes to form seals along'the` edges of the stoker as the ashes collectin. the .spaces'between the sides of the grate bars 17 and the Wall 20 and between the lower ends of the grate bars 17 and the upper iianges of the angles 21.

I claim: f

, l. In a. chain lgrate Stoker-fired furnace, an endless grate frame comprising a series of pivotally connected links at opposite sides of said frame, rigid transversely extending plates connected to `pairs of corresponding links at the opposite sides of said frame and projecting bevyond the outer sides of said links, a series of transversely extending rows of fuel supporting grate bars carried by saidplates, and grate sealing members each having a at outer side mounted on and substantially iiush withthe projecting portion fof each of said plates, a recess in said nat outer side, and means' in said recess for de` tachably connecting each grate sealing member and the corresponding plate, said Sealingn'iem bers coacting with an adjacent furnace Awall structure to provide an ash receiving pocket along the side of said Stoker, the grate sealing members capping the rigid plates to hold their grate bars in their operative positions. o

2. In a chain grate Stoker-fired furnace, a track, an endless grate frame adapted to travel around said track and comprising a series of] pivotallyconnected links at opposite sides of said frame, rigid transversely extending plates ,con-.-

nected to pairs of corresponding links at the opposite sides of said frame and projecting beyond the outer sides of said links, track engaging wheels carried by said links, a series of transversely extending rows of fuel supporting grate bars carried by said plates, grate sealing members each having a flat outersurface slotted to receive the projecting portion of one of vsaid platesand having a recess formed therein intersecting'said slotted portion, and means positioned in said recess for connecting said sealing member to said plate, the grate sealing members capping the rigid plates to hold their grate bars in their operative positions.

3. In a chain grate stoker, a track, an endless grate frame adapted to travel around said track and comprising a series of pivotally connected links at opposite sides of said frame,v a rigid tranversely extending supporting bar connecting corresponding links at opposite sides of said frame adjacent one end thereof, rigid transversely extending plates connected to said corresponding links at opposite sides of said frame at points spaced forwardly of corresponding supporting bars and each having a bulbous head projecting above the upper edges of said links and supporting bar in the upper run of said Stoker, track engaging wheels carried by said links, and a series of transversely extending rows vof grate bars, each having a recess in its under side receiving the bulbous head of a corresponding plate and having its rear end arranged to rest on the forward portion of a corresponding grate bar in the succeeding row while in the upper run of the stoker and on the associated supporting bar whenever it is unable to engage said corresponding grate bar in said upper run.

4. In a chain grate Stoker, a track, an endless grate frame adapted `to travel around said track and comprising a series of pivotally connected links at vopposite sides of said frame, a rigid transversely extending supporting bar connecting corresponding links at opposite sides of said framev links at opposite sides of said frame at points` spaced forwardly of the corresponding supporting bars and each having a bulbous head projecting above the upper edges of said links and supporting bar in the upper run of said Stoker, track engaging wheels carried by said links, a series of transversely extending rows of grate bars, each having a recess in its under side pivotally receiving the bulbous head of a corresponding plate and having its rear end arranged to rest on the forward portion of a corresponding grate bar in the succeeding row while in the upper run of thefstoker and on the associated supporting bar whenever it is unable to engage said grate bar in said upper run, the alternate grate bars in each row having a larger recess to permit pivotal movement relative to the plates associated therewith greater than adjacent grate bars in the same row.

, 5. In a chain grate Stoker, a track, an endless grate frame adapted to travel around said track and comprising a series of pivotally connected links at opposite sides of said frame, a rigid transversely extending supporting bar connecting corresponding links at opposite sides of said frame adjacent one end thereof, rigid transversely extending plates connected to said corresponding links at oppositeV sides of said frame at points spaced forwardly of the corresponding supporting bars and each having a bulbous head projecting above the upper edges of said links and supporting bar in the upper run of said Stoker, said plates projecting beyond the outer sides of said links, track engaging wheels carried by said links, a series of transversely extending rows of grate bars, each having a recess in its under side pivoti ally receiving the bulbous head of a corresponding plate and having its rear end arranged to rest on the forward portion of a corresponding grate bar in the succeeding row while in the upper run of the Stoker and on the associated supporting bar Whenever it isl unable to engage said corresponding grate bar in said upper run, and grate sealing members mounted on the projecting portions of said plates and adapted to coact with an adjacent wall to form a seal for said stoker.

ALFRED EDWARD PARKER. 

